👉 "Phonolite" is a term used in geology to refer to certain types of igneous rocks that are typically composed of quartz and feldspar grains. These rocks are often found within a volcano's lava flow, and they can vary in size, shape, and composition depending on the location of their formation. The term "phonolite" is derived from the Latin word "phon," which means "sound." This term was first used by Charles Darwin in his book "

phonolite